Chapter09 - CHAPTER 9 ICMP Exercises 1 a The original message is lost in transit The sender can re-send the message b The reply is lost in transit

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1 CHAPTER 9 ICMP Exercises 1. a. The original message is lost in transit. The sender can re-send the message. b. The reply is lost in transit. The sender can re-send the message. c. The original message was corrupted and discarded. The sender can re-send the message. 3. It could happen that host B is unreachable, for some reason. The error message generated by an intermediate router could then be lost on its way back to host A. Or perhaps the datagram was dropped due to congestion and the error message generated by an intermediate router was lost. 5. The maximum value is 59 because the pointer points to a byte somewhere in the original IP header (a maximum of 60 bytes). An offset of 0 would point to the first byte, so an offset of 59 would point to the 60th byte.
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SECTION 2 7. See Table 9.1. 9. The one way time is not the round trip divided by 2 because the request packet may have traveled by a different route than the response packet. In this case, the
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This note was uploaded on 04/26/2010 for the course CSE CS501 taught by Professor Dmathur during the Winter '10 term at National Institute of Technology, Calicut.

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Chapter09 - CHAPTER 9 ICMP Exercises 1 a The original message is lost in transit The sender can re-send the message b The reply is lost in transit

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